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Nice design, I'm thinking I might try this for a UL tarp for backpacking. With a 12' ridge and 96" spread it looks to be about 4 SY total fabric, would think that the whole tarp including guyline could be kept under 10 oz, but that could just be wishful thinking....

Below are some images. All of these can be cut from a 60" wide piece of fabric and have no seams. The downside of no ridge line seam is an "unpretty" pitch at the ridgeline because it rounds out a lot. But as I mentioned in the first post of this thread, it withstood a GA summer thunderstorm, which was pretty nasty. The last thing I was concerned about was how pretty the pitch was.

1st pic
3 tarps stacked showing coverage. I sleep feet to the left so the asym will be opposite for feet to the right. Shown in "xray mode" so the brown one is actually yellow so the yellow edges are the part of the brown tarp.
purple is 11'RL x 87", slight asym
pink is 10'RL x 102", heavy asym. This one is similar dimensions to a HH tarp
Brown/yellow is 10' RL x 78", very slight asym

The side coverage is pretty close to the same on the 10' and 11' tarps. The main difference is a little extra protection on the ends with the 11' tarp.

It appears the 105" wide pink tarp has much more coverage at the head and feet when laying on the diagonal , due to the more obtuse angle at the head and feet. I haven't mocked that one up yet. My thoughts are I'm gonna have multiple tarps anyway and if I plan on getting a lot of weather, I would rather have a cat cut hex tarp with me. If you're only gonna have only one tarp, it might be a good compromise between coverage, setup and weight for the milder climates.

2nd pic
tarp dimensions. All ridgelines run left to right, although in the pink one it appears not to. Fabric edges are running southwest to northeast. Cut lines are the other edges.

3rd pic
Top view of the 10'RL x 78" wide tarp pitched at a 45 degree angle, storm mode and pretty steep. Person in picture is 72" toe to head. It has more coverage as you reduce the pitch angle.

4th pic
different view of the 10'RL x 78" wide tarp showing pitch angle. Tarp is 15" above the face of the person. I would drop tarp down onto my hammock ridgeline in storm mode to increase protection from blowing rain.

These tarps designs are great. And I'd imagine they would be pretty light.
But cut against the bias, won't they prone to drooping in the middle.
Seems like the other diamond/asym cut tarp have that issue?

The downside of no ridge line seam is an "unpretty" pitch at the ridgeline because it rounds out a lot. But as I mentioned in the first post of this thread, it withstood a GA summer thunderstorm, which was pretty nasty. The last thing I was concerned about was how pretty the pitch was.

The ridgeline is floppy in mine also. The sides are not. One thing that helped was to hang it a loose on the ridgeline and pull the sides very tight. Then I raised the ridgeline a little. It didn't allow much. I didn't really care about the floppy, especially after the wind it withstood.

One unintended benefit of having the bias on the ridgeline which meant a bias cut only on 1/2 of each sides was it pitched pretty tight on the sides with only one stake.

Pulling on the bias can actually give a tighter pitch if only able to tighten in one direction. An example borrowed from Slo Sails and Canvas illustrates this.